Mixer timer



Aug 13, 1929. ROSENDAHL 1,724,369

MIXER T IMER Filed May 26, 1927 2' Sheets-Sheet g [1929- N. M. ROSENDAKHAL 1,724,369

MIXER TIMER.

Filed May 26,1927 2 Sheets-Sheet 2 INVENTOR' ATTORN EY Patented Aug. 13, 1929.

airs sra'rs FATNT er.

NILS M. ROSENDAHL, OF NATERLOO, IOWA, ASSIGNOE, T CONSTRUCTION MACHIN- ERY COMPANY, A CORPORATION OF IOWA.

MIXER TIMER.

This invention relates to timers particularly adapted for use on concrete mixers or the like, the principal object being to provide a more simple and efficient device of this character than heretofore known; the same relating to an improved attachment for a meter such as illustrated in my copending application for patent upon improvements in timers, Serial Number 133,108 filed Sept. 3,1928.

Other objects and advantages of the specific structure will appear in the further description of the invention.

Referring now to the accompanying drawing, forming part of this application, and wherein like reference numerals indicate like parts;

Figure 1 is a front elevation of a timer as set for operation, the cover of the housing being removed;

Figure 2 is a sectional view through an extension of the back of the housing illustrating the mixer control mechanism ready to act as a stop to prevent dumping of the mixer;

Figure 3 is a like view to Figure 2 showing the mechanism in the opposite position permitting dumping of the mixer;

Figure 4 is a view identical with Figure 1 except that the mechanism is shown in the position of sounding the alarm; resulting in the mixer control mechanism assuming the position shown in Figure .3 and Figure 5 is a side elevation of a fragmental portion of a mixer with the meter attached.

1 represents the housing for the timer which is mounted in any convenient manner adjacent the mixer indicated at 2 which is pivotally supported within the trunnion cradle or yoke 3, the operating shaft of the mixer being shown at 4 and driven by the usual sprocket wheel 5.

I have illustrated as spaced from the upright 6 of the mixer a suitable outboard bearing 7 for the shaft 1 and between which I prefer to mount the timer. Pivotally supported upon the outboard hearing, as at 8, is mounted a crank arm 9 carrying a roller 10 in its upper end for engagement with the inclined face of the disc 11 attached to the back of the sprocket 5, so that a back and forth movement is imparted to the upper end of the lever.9 as the shaft lis rotated, this in turn transmitting a similar motion to the connecting rod 12 uniting the lower end of the arm 13 of the timer to the lower end 14 of .the arm 9. This connection it will be seen'imparts only a direct motion in one direction to the lever 13, and therefore I have provided a contractile helical spring 15 attached in any desired manner to the lower end of the lever 13.

The specific construction of the operating mechanism within the timer is not essential to the carrying out of my present invention, except that in such mechanism there exists a shaft housing indicated at 16 pivotally mounted as at 17, and carrying the upwardly projecting fixed arm 18. This housing is made to tip upwardly in respect to the end carrying the lever at a predetermined time during the operation of the mechanism, and further that an upstanding lever indicated at 19 is pivotally mounted as at 20 within the meter, the upper end of which is connected by a contractile spring '21 to the lever 18, such structure being old.

in the art and furthermore clearly described in my copending application.

' Now the mechanism embodying my present invention comprises a normally horizontally disposed lever illustrated at 22 being rigidly attached in any desired manner to the shaft housing 16, as for example about the pivotal mounting of said housing, so that when the levered end of the shaft housing is tipped upwardly the lever 22 will also be tipped upwardly, and vice versa. In the free end of the lever 22 is an elongated hole 28 for engagement with the pin 24 fixed to the vertically disposed reciprocable shaft 25 mounted within the upper and lower walls of the rectangularly shaped extension 26 on the back of the housing 1. This shaft 25 is formed with a notch 27, on the side opposite to that to which the pin 24 is mounted, and, normally parallel with the shaft 25 and spaced therefrom, is pivotally mounted as at 28 the lever arm 29, carrying intermediate of its ends a roller 30 for intermittent registration with the notch 27 in the shaft 25;

the upper and lower termini of which notch are inclined so that motion either up or down ofthe shaft 25 when the roller 30 is in said notch-will force the roller therefrom as shown in Figure 2 of the drawings. To

nally of the extension 26. A rectangularly shaped stop rod 34 is pivotally and swingingly mounted as at 35 in any desired manner, slightly above and back of the timer so that the free end thereof will constantly lie intermediate of the pins 33 on the plunger bolt 32. The free end of the stop rod 34 when in its outermost position as shown in Figures 2 and 5 is designed to be engaged by the corner plate 36 attached to the cradle 3 of the mixer when the cradle moves towards dumping position and to thus prevent its going to such position, whereas when the stop rod 34 is in its inactive position as shown in full lines Figure 3 and dotted lines Figure 5, it will not engage the plate 36 but permit of the mixer going to dumping position, and when the mixer has been re turned from dumping position to its normal mixing position, the charging skip, not shown, when charging the mixer will engage the free end 37 of the crank arm 38 of the shaft 40 mounted upon one side of the timer housing, and carrying upon its innermost end a bell crank 41 to which a rope 42 is attached which passes through the side of the housing for fixed engagement with the lever 19 as at 43, so that when the charging skip engages the crank arm 38 it will force the bell crank 43 outwardly from the housing, imparting a stress upon the rope 42 and draw the lever 19 back to its normal upright position, thus drawing downwardly the shaft housing 16 with its time operating gear 44 into operable position with the timer mechanism. Thus, when said mechanism, having been previously set for a predetermined number of revolutions of the shaft 4, proceeds to function, the mixer control mechanism will simultaneously function in preventing the mixer being dumped until the predetermined number of revolutions is accomplished, when, simultaneously with the automatic throwing out of gear of the timer, the mixer locking mechanism will become inactive.

In addition to the above cooperative mech' for engagement by the clapper 46 mounted as at 47 upon the upper free end of the lever 19 so that when the timer mechanism reaches the terminus of its cycle and the lever 19 is thrown towards the lever 18, the clapper will strike the gong, this occurring simultaneously with the unlocking of the timer.

As before stated, the instant invention resides in the cooperatitve specific mechanism with the timer for preventing the dumping of the mixer before the batch is completely mixed, and the simple mechanism for sounding an alarm at such time as when the batch has been properly treated.

Having thus described my invention, what I claim and desire to secure by Letters Patent, is:

1. The combination with a timer of the type described, of a horizontally reciprocable bolt extending therefrom, a stop rod adjustably carried by said bolt, and means for resetting the timer.

2. The combination with a timer of the type described, of a horizontally reciprocable bolt extending therefrom, a stop rod adjustably operated by said bolt, and means for resetting the timer.

The combination with a timer of the type described, of a reciprocable bolt ex tending therefrom, a stop rod operated by said bolt, and means for supporting the stop rod independently of the timer.

4. A device of the type described comprising in combination a rotative element, a timer cooperatively associated therewith, means within the timer for sounding an alarm, 21 reciprocable rod for operating said means, means connected with the rotative element for operating the reciprocable' arm, means extending outwardly of the timer, a stop rod connected with said means, and means operable by the stop rod for cooperation with the alarm mechanism at a predetermined number of revolutions of the rotative element.

In testimony whereof I affix my signature.

NILS M. ROSENDAHL. 

